82 Journal of the Asiatic Society of Bengal. [N.S., XV, 
The writer, who has, perhaps. had more opportunity than 
anyone else of observing these boulder conglomerates through- 
out India, is inclined to consider that the interest attaching to 
them is greater than that of any ordinary pebble bed or accu- 
mulation of boulders. Although their peculiarities have not 
hitherto escaped me, and while realizing that these features 
must have some special significance, I have not, up to now, 
think that, at all events in its broad outlines, it may commend 
itself to geologists generally. 
ore proceeding further it is necessary to summarize the 
known facts regarding the composition and occurrence of the 
Siwalik boulder conglomerates and of their distribution in 
India. 
The area in which these beds reach-their maximum de- 
thickness of more than 5,000 feet. Thence they regularly re- 
appear in the same stratigraphical position in each of the five or 
coarse sandstones with abundant pebbles alternating with clays, 
with a distinct representative of the Middle Siwaliks and with 
the Lower Siwaliks or Nahans. It is almost certain that the 
